include/diogenes.text.inc.php

   1 <?php
   2 /*
   3  * Copyright (C) 2003-2006 Polytechnique.org
   4  * http://opensource.polytechnique.org/
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 require_once 'diogenes/diogenes.misc.inc.php';
  22
  23 /** Protect a text block and encode it as base64.
  24  */
  25 function textProtectTag($tag_open, $tag_close, $prot_open, $prot_close, $input)
  26 {
  27   $splits = preg_split("/($tag_open|$tag_close)/",$input,-1,PREG_SPLIT_DELIM_CAPTURE | PREG_SPLIT_NO_EMPTY);
  28
  29   $output = "";
  30   $depth = 0;
  31   while ($block = array_shift($splits)) {
  32     if (preg_match("/^$tag_open$/", $block)) {
  33       if ($depth == 0) {
  34         $save = "";
  35       }
  36       $save .= $block;
  37       $depth++;
  38     } else if ($depth > 0) {
  39       $save .= $block;
  40       if (preg_match("/^$tag_close$/", $block))
  41       {
  42         $depth--;
  43         if ($depth == 0)
  44         {
  45            $output .= $prot_open.base64_encode($save).$prot_close;
  46            $save = "";
  47         }
  48       }
  49     } else {
  50       $output .= $block;
  51     }
  52   }
  53
  54   return $output;
  55 }
  56
  57
  58 /** Unprotect base64 blocks.
  59  */
  60 function textUnprotectTags($prot_open, $prot_close, $input)
  61 {
  62   $splits = preg_split("/($prot_open.+$prot_close)/",$input,-1,PREG_SPLIT_DELIM_CAPTURE | PREG_SPLIT_NO_EMPTY);
  63   $output = "";
  64
  65   foreach ($splits as $block) {
  66     if (preg_match("/^$prot_open(.+)$prot_close$/", $block, $match)) {
  67       $output .= base64_decode($match[1]);
  68     } else {
  69       $output .= $block;
  70     }
  71   }
  72
  73   return $output;
  74 }
  75
  76
  77 /** Protect HTML code from Textism.
  78  */
  79 function htmlProtectFromTextism($input)
  80 {
  81   return textProtectTag("<table\s*?[^>]*>", "<\/table>", "{NOP:", ":NOP}", $input);
  82 }
  83
  84
  85 /** Restore HTML code that was protected from Textism.
  86  */
  87 function htmlUnprotectFromTextism($input)
  88 {
  89   return textUnprotectTags("{NOP:", ":NOP}", $input);
  90 }
  91
  92
  93 /** Protect PHP code.
  94  */
  95 function phpProtect($input)
  96 {
  97   return textProtectTag("<\?php", "\?>", "{PHP:", ":PHP}", $input);
  98 }
  99
 100
 101 /** Unprotect PHP code.
 102  */
 103 function phpUnprotect($input)
 104 {
 105   return textUnprotectTags("{PHP:", ":PHP}", $input);
 106 }
 107
 108
 109 /** Convert XHTML-compliant tags to plain HTML.
 110  */
 111 function xhtmlToHtml($input)
 112 {
 113   return html_accent(preg_replace("/<(br|img|input|p)( [^\/]*)?\/>/","<\$1\$2>",$input));
 114 }
 115
 116
 117 /** Restore XHTML-compliant tags.
 118  */
 119 function htmlToXhtml($input)
 120 {
 121   return preg_replace("/<(br|img|input)( [^>]+)?>/","<\$1\$2/>",$input);
 122 }
 123
 124
 125 ?>